The Stylus Pro is a sleek compact pen sized, two AAA alkaline battery powered flashlight designedfor use in all markets. It features a tail cap switch, momentary or constant on operation, a pocketclip for convenience, and amazing brightness and run time for a light of its size and price. Thealuminum housing with Type II Military Spec anodizing helps make the light extremely durable andabrasion resistan Durable, anodized machined aircraft aluminum construction Push-button tail switch Two ���AAA��� alkline batteries (included) Removable pocket clip C4 LED produces 90 lumens; 860 candela; 58m beam; runs 6.5 hours IPX4 water-resistant About the size of a marker